import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from '../components/Login.vue'
import Home from '../components/Home.vue'
import Welcom from '../components/welcom.vue'
import Users from '../components/users/Users.vue'

Vue.use(VueRouter)

const routes = [
    {path:'/',redirect:'/login'},
    {path:'/login',component:Login},
    {path:'/home',component:Home,
     redirect:'/welcom',
     children:[
       {path:'/welcom',component:Welcom},
       {path:'/yh',component:Users}
     ]
  }
]

const router = new VueRouter({
    routes
})
// 挂载路由导航守望
router.beforeEach((to,from,next)=>{
  //to表示将要访问的路径
  //from代表从哪个路径跳转而来
  //next是一个函数，表示放行
  // next() 放行 next('/login') 强制跳转

  if(to.path==='/login') return next();
  // 获取token 查看是否登录状态，如果不是登录状态那么强行跳转到/login
  const  tokenStr = window.sessionStorage.getItem('token')
  if(!tokenStr) return next('/login')
  next()
})

export default router
